I'm totally absorbed in building this bookcase.

我全神贯注地做这个书柜。


I'm totally… 我完全…          例：I was totally engrossed  in the game and lost track of the time.我完全被比赛吸引而忘了时间。I was totally involved in my painting and never heard the telephone ring.我专心作画，没听见电话铃响。